#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	int a, b, c;
	while (scanf(" %d %d %d", &a, &b, &c) != EOF)
	{
		if ((a + b) > c && (a + c) > b && (b + c) > a)
		{
			if (a == b && a == c)
			{
				printf("Equilateral triangle!\n");
			}
			else if (a == b && b != c || a == c && b != c || b == c && c != a)
			{
				printf("Isosceles triangle!\n");
			}
			else
			{
				printf("Ordinary triangle!\n");
			}
		}

		else
		{
			printf("Not a triangle!\n");
		}

	}

	return 0;
}

